3m Innovative Properties Company

Rainer K Dittmann

Christian A Richter

Anja B Fischer

Anthony A Bredebusch

Hans R Schnagl

Grit Kindler

Malte Korten

Holger Hauptmann

Gallus Schechner

Michael Jahns

Andreas G Herrmann

Stefan Hoescheler

Björn Theelke

Michael Sogl

Michaela Urban

Dajana Maria Anna Zimmermann

A method of making a monolithic dental restoration. The method includes the steps of providing a monolithic precursor of a dental restoration and firing the monolithic dental restoration precursor to provide the monolithic dental restoration. The zirconia material of both the dental restoration precursor as well as the dental restoration has a relative density of greater than 98% of the theoretic density of the zirconia material. The invention helps providing a color of a non-glazed dental restoration which resembles the color of a glazed dental restoration.

Method of making a dental restoration

The invention relates to a porous zirconia article in particular for use in the dental or orthodontic field, the porous zirconia article comprising ZrO: 80 to 87 wt. %, YO: 3 to 5 wt. %, AlO: 10 to 14 wt. %, wt. % with respect to the weight of the porous zirconia article, the porous zirconia article being characterized by a BET surface from 15 to 100 m/g. The invention also relates to a sintered zirconia article in particular for use in the dental or orthodontic field, the sintered zirconia article comprising ZrO: 80 to 87 wt. %, YO: 3 to 5 wt. %, AlO: 10 to 14 wt. %, wt. % with respect to the weight of the porous zirconia article, the sintered zirconia article being characterized by a corundum crystal phase content of 7 to 12 wt. % and a flexural strength of at least 2,000 MPa.

Zirconia article with high alumina content, process of production and use thereof

The invention relates to a porous multi-layered coloured zirconia dental mill blank comprising a bottom layer B having the composition COMP-B which comprises ceramic components CER-COMP-B, colouring components COL-COMP-B and stabilizing components STAB-COMP-B, a top layer E having the composition COMP-E which comprises ceramic components CER-COMP-E, colouring components COL-COMP-E stabilizing components STAB-COMP-E, at least one intermediate layer Ex having the composition COMP-E of top layer E, at least one intermediate layer Bx having the composition COMP-B of bottom layer B, x being an integer and indicating the number of intermediate layers, wherein the layers with compositions COMP-B and COMP-E are arranged in alternating order, and wherein the thickness of the individual layers B, Bx is decreasing from bottom to top and the thickness of the individual layers E, Ex is decreasing from top to bottom. The dental mill blank can be used for producing dental articles.

Multi-layered zirconia dental mill blank and process of production

A device for powder based additive material manufacturing of dental appliances. The device has a recoater () for providing a powder layer to a build area. The recoater () has a slide () and is adapted for dispensing of the powder to the build area. The recoater () has further at least two powder supplies for individually supplying a first and a second powder on the slide () and a powder transport section in which the first and second powder are brought in touch with each other for at least partially merging. The invention is advantageous in that it allows providing dental blanks having color gradients in all three dimensions.

Device for powder based additive material manufacturing of dental appliances

The present disclosure relates to a dental ceramic article comprising ceramic components, the ceramic components having ZrO2 and Al2O3 and at least one component comprising Mn, Er or mixtures thereof, Al2O3 being present in an amount below about 0.15 wt.-% with respect to the weight of the ceramic article. The present disclosure relates also to kit of parts comprising a ceramic article and a coloring solution and processes for producing a dental ceramic article.

Dental ceramic article, process of production and use thereof

A sintering support comprising a fully stabilized zirconia outer surface; wherein the sintering support withstands sintering a ceramic part in contact with the outer surface without adhesion between the outer surface and the ceramic part, and methods of making and using the sintering support are disclosed.

Sintering support comprising fully stabilized zirconia outer surface and crystalline phase composition, and method of making thereof

A system and method for sintering dental restorations. The system can include a monolithic sintering support comprising a surface, and at least one dental restoration positioned in direct contact with the surface of the monolithic sintering support. The method can include providing a monolithic sintering support comprising a surface, positioning a dental restoration in direct contact with the surface, and sintering the dental restoration while the dental restoration is in direct contact with the surface of the monolithic sintering support to form a sintered dental restoration.

Growing community of inventors

Munich, Germany

Rainer K Dittmann